VULNpocalypse

CVE-2026-73666: OpenChoreo: Unauthenticated Backstage developer-portal API exposes OpenChoreo catalog data, scaffolder logs, and allows unauthenticated catalog write/delete

Advisory generated from the CVE record, CISA, Exploit Observer and VEDAS: what it is, whether it is exploited, who is affected, and how to fix and detect it.

Generated by VEDAS. Scores as of 2026-11-01 19:19 UTC. Rebuilt every few hours from cve-scores, CISA KEV and vedas-signatures. How this works and its limits.

What it is

OpenChoreo is a developer platform for Kubernetes. Prior to 1.0.4, 1.1.4, and 1.2.1, the OpenChoreo Backstage backend hardcoded backend.auth.dangerouslyDisableDefaultAuthPolicy and auth.providers.guest.dangerouslyAllowOutsideDevelopment to true, exposing /api/* without authentication and allowing unauthenticated catalog reads, scaffolder log reads, and catalog location creation or deletion. This issue is fixed in versions 1.0.4, 1.1.4, and 1.2.1.

Description quoted from the CVE record (assigned by GitHub_M, published 2026-08-13).

Weakness: CWE-306: Missing Authentication for Critical Function

How it can be exploited

Exploitable over the network with low attack complexity needing no privileges and no user interaction. Impact: confidentiality high, integrity low, availability none. CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

CISA assessment (SSVC): CISA has no evidence of exploitation. Automatable: yes. Technical impact: partial.

Public exploit evidence (Exploit Observer)

Also known as: EUVD-2026-58543

VEDAS cluster: VEDAS:DAUGHTERDAYDREAM

Exploit Observer links 5 pieces of public exploit code or detection modules that name this CVE or one of its aliases.

Exploit code and modules (5)

Code that names this CVE. A repository can be a working exploit, a scanner, a fake or malware; read it before running anything.

Vulnerability databases and vendor advisories (2)

Catalogue entries, not exploit evidence.

5 more references returned by Exploit Observer did not name this CVE or an alias, so they are left out.

VEDAS data as of 2026-11-01T17:12 UTC; fetched 2026-11-02.

Live scores

EPSS
0.007
low predicted chance of attack
VEDAS
0.987
strong exploit evidence
On CISA KEV
Not listed
Detection rule
Nuclei · Suricata

Who is affected

ProductAffectedNot affected
openchoreo backstage-pluginsversion < 1.0.4
version >= 1.1.0, < 1.1.4
version >= 1.2.0-rc.1, < 1.2.1		Not stated

Version ranges exactly as the CVE record states them. “Before X” means X is the first fixed version.

How to fix it

No fixed version or vendor advisory is listed in the CVE record yet. Watch the vendor’s security page.

How to detect it

Nuclei template (active check)

OpenChoreo - Unauthenticated Backstage Catalog API Access

OpenChoreo before 1.0.4, 1.1.4 and 1.2.1 ships a Backstage backend that hardcodes backend.auth.dangerouslyDisableDefaultAuthPolicy and the guest provider’s dangerouslyAllowOutsideDevelopment to true, exposing /api/* without authentication. An unauthenticated attacker can read the software catalog, scaffolder logs and create or delete catalog locations. This template confirms the flaw non-destructively by reading the Backstage catalog entities endpoint without any credentials.

Name and description quoted from the template, written by VEDAS.

The template sends 1 request (GET /api/catalog/entities); it decides using status, word matchers. Severity in the template: high. Marked as not yet verified against a live vulnerable target.

Run it against a host you own or are authorised to test:

bash
nuclei -u https://your-host -t CVE-2026-73666.yaml
Show the template (48 lines)
yaml
id: CVE-2026-73666

info:
  name: "OpenChoreo - Unauthenticated Backstage Catalog API Access"
  author: vedas-arpsyndicate
  severity: high
  description: |
    OpenChoreo before 1.0.4, 1.1.4 and 1.2.1 ships a Backstage backend that hardcodes
    backend.auth.dangerouslyDisableDefaultAuthPolicy and the guest provider's
    dangerouslyAllowOutsideDevelopment to true, exposing /api/* without authentication. An
    unauthenticated attacker can read the software catalog, scaffolder logs and create or delete
    catalog locations. This template confirms the flaw non-destructively by reading the Backstage
    catalog entities endpoint without any credentials.
  reference:
    - https://www.exploit.observer/?keyword=CVE-2026-73666&match=exact
    - https://subdomain.center/?engine=ammonites&keyword=openchoreo&match=exact
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
    cvss-score: 8.2
    cve-id: CVE-2026-73666
    cwe-id: CWE-306
  metadata:
    verified: false
    max-request: 1
  tags: cve,cve2026,openchoreo,backstage,missing-auth,unauth

http:
  - method: GET
    path:
      - "{{BaseURL}}/api/catalog/entities"
    headers:
      Accept: application/json
    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - "apiVersion"
          - "metadata"
          - "relations"
        condition: and
      - type: word
        part: header
        words:
          - "application/json"
      - type: status
        status:
          - 200

CVE-2026-73666.yaml on GitHub

Suricata rules (network detection)

1 rule that alert on traffic matching this exploit: VEDAS CVE-2026-73666 OpenChoreo - Unauthenticated Backstage Catalog API Access Attempt. Add them to your Suricata rule set and reload.

Show the rules
suricata
alert http $EXTERNAL_NET any -> $HTTP_SERVERS $HTTP_PORTS (msg:"VEDAS CVE-2026-73666 OpenChoreo - Unauthenticated Backstage Catalog API Access Attempt"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/api/catalog/entities"; fast_pattern; nocase; classtype:web-application-attack; reference:cve,CVE-2026-73666; reference:url,https://www.exploit.observer/?keyword=CVE-2026-73666&match=exact; reference:url,https://subdomain.center/?engine=ammonites&keyword=openchoreo&match=exact; sid:1081600; rev:1;)

CVE-2026-73666.rules on GitHub

References

Other references

Other databases

Where this comes from

This advisory is generated automatically by VEDAS from: CVE.org record, cve-scores (EPSS and VEDAS), Exploit Observer, vedas-signatures. Text in quotes is reproduced from the source; everything else is a fixed template filled with source fields. Nothing here is written by a language model. Check the vendor advisory before acting, and read how VEDAS and Exploit Observer work, and their limits.